what is the upper and lower plenum?

[cleanjdm]

what the title states. oh, and are all the plenums the same with the a1-a6's?

[c mak]

That is the upper and lower part of the intake manifold. If you look at it, its stacked together with a sandwich plate in between the two. All the stock f22 manifolds are the same, but the a6 is a little bit larger and flows more. Even the H23 and f22B dohc mani's are interchangeable.

Why, what cha thinking about doing? Swaping manifolds?

[cleanjdm]

That is the upper and lower part of the intake manifold. If you look at it, its stacked together with a sandwich plate in between the two. All the stock f22 manifolds are the same, but the a6 is a little bit larger and flows more. Even the H23 and f22B dohc mani's are interchangeable.

Why, what cha thinking about doing? Swaping manifolds?

thanx foor tha info , yupp i wanna do the a6 intake mani with h23 tb. i think that will be best. or is the h23 inatke mani better?

[c mak]

I have actually read on here somewhere that using a h23 upper and a6 lower or vise versa is the best combination to do that nets the best gains.

[jdmsilvercb7]

I think the h23 has a bigger upper plenum then the a6 does. In any case they both have the butterflies so you can use a new ecu, or you could just let it create a vacuum and just open itself. Usually a new ecu is best.

[cleanjdm]

I think the h23 has a bigger upper plenum then the a6 does. In any case they both have the butterflies so you can use a new ecu, or you could just let it create a vacuum and just open itself. Usually a new ecu is best.

i will be using the pt6 ecu and wire in the IAB box as well

[Losiracer2]

the ideal swap is using the H23TB/Plenum and A6 runners. Here's a pic showing how much larger volume wise the H23 plenum is vs the A6 plenum



Oh and the Plenum is the upper part, then you got the butterfly IAB plate and then the lower runners.

[cleanjdm]

the ideal swap is using the H23TB/Plenum and A6 runners. Here's a pic showing how much larger volume wise the H23 plenum is vs the A6 plenum



Oh and the Plenum is the upper part, then you got the butterfly IAB plate and then the lower runners.

thanx, i always forget which is which.

[jtkustomizer]

Thats what I want to do also but need to find the parts.

[deevergote]

For those stating their facts... why are the A6 runners best?

And yeah, the plenum is the upper part. There is only one plenum.

[Losiracer2]

For those stating their facts... why are the A6 runners best?

And yeah, the plenum is the upper part. There is only one plenum.

A6 runners are supposedly better for higher RPM since they're a little longer, i believe that's what owequitit informed me of. H23 runners are more for low end torque since they're shorter.

[owequitit]

The A6 runners are shorter, the H23's are longer.

Also, not all F22Ax manifolds are the same.

The F22A1 and F22A4 manifolds are NOT interchangeable with the H series parts.

The H series TB's will NOT bolt to an F22 plenum.

The OP has 2 choices.

1) Swap an entire H23 manifold on the car. This is probably the easiest, and most effective route in his situation.

2) Swap an A6 lower manifold with an H series plenum and TB.

[wed3k]

The A6 runners are shorter, the H23's are longer.

Also, not all F22Ax manifolds are the same.

The F22A1 and F22A4 manifolds are NOT interchangeable with the H series parts.

The H series TB's will NOT bolt to an F22 plenum.

The OP has 2 choices.

1) Swap an entire H23 manifold on the car. This is probably the easiest, and most effective route in his situation.

2) Swap an A6 lower manifold with an H series plenum and TB.

correct, plus the egr ports are easier to access with the removable plugs instead of drilling holes.